US3357979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process improvement for preparing cyanuric acid
Assignee: Monsanto Co
•
Filing: 1965-10-01
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Granted: 1967-12-12
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Expires: 1985-10-01
Abstract
No abstract record available.
Inventors
- 👤 Eugene C Sobocinski
- 👤 William F Symes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:12
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS FOR PREPARING SUBSTANTIALLY PURE CYANURIC ACID WHICH COMPRISES THE STEPS OF ADMIXING AN AQUEOUS SOLUTION CONTAINING CRUDE CYANURIC ACID WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION TO FORM A DI-ALKALI METAL CYANURATE SOLUTION; CONTACTING SAID CYANURATE SOLUTION WITH CARBON; REMOVING SAID CARBON FROM SAID CYANURATE SOLUTION; FEEDING SAID CYANURATE SOLUTION AND AN AQUEOUS SOLUTION OF A MINERAL ACID INTO AN ACIDIC WATER HEEL, MAINTAINED AT A TEMPERATURE GREATER THAN 20*C., AT A RATE SUFFICINET TO FORM CYANURIC ACID PARTICLES HAVING A PARTICLE SIZE DISTRIBUTION SUCH THAT LESS THAN 20% BY WEIGHT THEREOF WILL PASS THROUGH A NO. 200 MESH U.S. STANDARD SCREEN; AND SEPARATING SAID CYANURIC ACID PARTICLES FROM THE RESULTANT SOLUTION, SAID ACID ADDITION RATE BEING SUFFICIENT TO MAINTAIN THE HEEL AND RESULTANT SLURRY AT A PH OF FROM ABOUT 0.75 TO ABOUT 3.0.
Claim 2
Dependent Claim
137 words
A PROCESS FOR PREPARING SUBSTANTIALLY PURE CYANURIC ACID WHICH COMPRISES THE STEPS OF ADMIXING AN AQUEOUS SOLUTION CONTAINING CRUDE CYANURIC ACID WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION TO FORM A DI-ALKALI METAL CYANURATE SOLUTION; CONTACTING SAID CYANURATE SOLUTION WITH CARBON; REMOVING SAID CARBON FROM SAID CYANURATE SOLUTION; FEEDING SAID CYANURATE SOLUTION AND AN AQUEOUS SOLUTION OF A MINERAL ACID INTO AN ACIDIC WATER HEEL, MAINTAINED AT A TEMPERATURE GREATER THAN 20*C., AT A RATE SUFFICINET TO FORM CYANURIC ACID PARTICLES HAVING A PARTICLE SIZE DISTRIBUTION SUCH THAT LESS THAN 20% BY WEIGHT THEREOF WILL PASS THROUGH A NO. 200 MESH U.S. STANDARD SCREEN; AND SEPARATING SAID CYANURIC ACID PARTICLES FROM THE RESULTANT SOLUTION, SAID ACID ADDITION RATE BEING SUFFICIENT TO MAINTAIN THE HEEL AND RESULTANT SLURRY AT A PH OF FROM ABOUT 0.75 TO ABOUT 3.0.
References Cited (Backward Citations)
US2744938A
Cited
US3236845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |